Silver Birch Tree Allergy

Silver birch trees are a deciduous plant of the birch family. Silver birch trees grow in climates indicative of northern hemisphere locations and are native to England. The pollinating season of the silver birch tree typically begins in August and extends throughout October. The pollen of a silver birch tree spreads through the air by wind. Silver birch trees are amongst the highest seasonal allergy-inducers.

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Significance

Silver birch trees are in the same family as alders and hazels and are closely related to oak and beech trees, meaning those individuals presenting allergies to trees related to the birch, are predisposed to silver birch tree sensitivity. Allergic individuals who come in contact with silver birch tree pollen react due to chemical histamine releases that occur throughout the body. Histamine leads to increased mucus within the nasal passages and airways, which causes inflammation-related reactions such as congestion, constricted breathing and general discomfort.

Cross-Reactivity

Cross-reactivity means that individuals allergic to a certain pollen such as the silver birch tree pollen may experience allergic reactions when eating foods that share a similar molecular structure because the body mistakes the food for the pollen. Silver Birch pollen has cross-reactivity to an array of fruits including apples, kiwis, peaches, pears, nectarines, cherries, apricots and plums. Cross-reactive vegetables include carrots, celery and potato peels. Hazelnut, Brazil nut and walnut also contain cross-reactive proteins.

Allergic-Asthma Symptoms

Allergic asthma is brought on by exposure to allergens that cause inflammation of the airways. Silver birch tree pollen may induce allergic asthma reactions when inhaled. Asthma symptoms include coughing, wheezing, shortness of breath, chest tightness and bronchial spasms that lead to attacks. Asthma symptoms are accompanied and exacerbated by birch tree hay fever symptoms of congestion and sneezing, leading to further breathing constriction due to increased swelling of the air passages.